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CaBS

SXDevelopments S15 (SXDS15) - Pursuit of the perfect circuit/road S15

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Well we headed down to Goulburn on Sunday night and crashed the night down there. Avoiding a really early morning for the big day ahead. JDM Yard had organised a private day which we managed to get word of (thanks Tom) and head down too. We ended up having to pull the intake manifold off again before leaving to swap out a snapped screw cap bolt in it but this happened without many dramas. We've got it down to a fine art now. :P

 

Thanks to John from Unique AutoSports for loaning us his trailer at mates rates the car gets on and off this thing easily.

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Started off with James doing a PB of a 104 flat in the first session.

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During the sessions we gradually worked our way down to 1.02.8, then 1.01.7, then 1.01.5 then finally 1.01.4 in the final session. But by the final session we were consistently sub 102 on flying laps. For a first time out with this setup and an owner driver team we're pretty stoked with. The car worked with only small issues we could fix throughout the day. Oil surge was basically a non issue with the changes we'd made.

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The splitter survived a high speed off at turn nine with only the under side rub plates copping it hard will need to replace these before the next time out.

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The amount of bugs out was rather insane, maybe pest control sponsorship is in order? :P

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Thanks again to the JDM Yard team for organising this is a shot of their integra which is entered in open class. Not sure what lap times it was doing but its looking wicked quick down the main straight and through the top. Looks like the car is torque steering pretty hard making for an exciting ride!

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Thanks to Jono from Bilstein Racing for his tech support via mobile with suspension tweaks. This really made all the difference to our day getting the thing dialed in much better and a more comfortable setup so James could push harder. We were all blown away by the large difference some very small changes made to the car. I'm hoping I can scrape the budget abit further and get this setup for my own car based on our experiences this weekend.

 

Incar from the lap.

 

I have some more footage of some "moments" and gopro from the front bar again which I can go through later and post.

 

More soon!

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Massive congrats James and co!

 

Crazy quick on the first time out. The power seems so linear...

 

Was that a mis-shift/over-rev as you crossed the line or had you already crossed?

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Nah he happened to miss 5th on that lap its not over the line yet either so would have cost a tenth or two.

Edited by CaBS

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Was that on the 1:01.4 lap?

 

Yup thats the lap the video is of

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Saw the 10 minute battle on the pitwall, car had so much grip and the speed you guys pack down the straight was addictive to watch.

 

Jdmyard car wasnt far off but seems like the s15 didn't need to work as many gears as the honda had to. Great job in flying the silvia flag

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Cheers guys. Still mulling over the laps and a there is definitely time left in it, and i'm kicking myself in a few areas I didn't drive differently but it was an awesome day, awesome bunch of people and I set a PB so I can't complain!

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NSCC Day this weekend heading down for some testing Pre WTAC. Cant wait to get out there again! =)

Also pretty excited to see what times out last minute entries can pull. I'm guessing... fast.

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Back from the track today. Was an interesting day... Started off with a bit of power steering fluid we noticed leaking that we thought was some residue of the fluid boiling at the last track day. What turned out to be the case was the high pressure side power steering line had been heat effected and was seeping. Given the high pressure involved we didn't want to take the chance of the line splitting and spraying on a hot manifold. pirtek was called and they were happy to fix. We ended up driving around all morning organising and had a repaired line back at the track with ps fluid by 10:30 had the car back together by 12. We were also keen to test a new front splitter we made with a lot more complex shapes. We weren't sure whether our theory was going to work in practice and also if it was going to be strong enough.

 

So after finally getting out on the track we found our splitter massively changed the balance we'd fine tuned the last time and the car was quite difficult to drive with high speed snap over steer which was interesting at turn 3 and 9. Actually had my first spin in a long time.

 

Added some more rear wing (now maxed) and it made it slightly better but still a hard drive. We're optimistic though as even with a pretty average lap the car did a 1.01.6 which is two tenths off the pb but it felt like there was more in it if we can get the rear to settle down. The next week leading to wtac is going to be very busy...

 

Pics to come.

 

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More wing required!? :shades:

Bigger end plates would be the easiest way to try to eek out some more downforce from the rear wing and something not limited by the rules?

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Nothing to do with the class - the area under the wing is more important than the area above for creating downforce and large end plates can help with that - the RE Amemiya wing is a perfect example of how they have attempted improve the effectiveness of their setup from last year....

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Thanks for all the support.. Was an insane week full of challenges but thats what makes wtac exciting.

 

I'll put up some footage and info shortly... Here is an entertaining teaser... We had a beautifully handling balanced car in practice but changing to the advans resulted in quite a different car. Really didn't expect it to change so dramatically but it did. We spent all of WTAC trying to get the car to handle nicely and tried literally everything but it just wasn't our weekend. Still had a ball though.

 

Below video was a last ditch test, we took off the new front aero we made thinking that maybe we just had way too much front downforce. The below video I turned in slower than all the other laps, although still turned in at about 230km/hr... Wheel turned in but the car definitely didn't! Needed a new race suit after this... Note even after going through the sand trap and out the other side I was still doing 80km/hr.

 

 

 

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Damn!

 

Was that just massive understeer!!?? I take it wasn't overspeeding the corner going by your 230km straight speed - surely the car is capable of much more than that.

 

In any case, was great to see you out there. Hope you sort the issues out and go back for a good crack and show what the car can really do :)

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Interesting that the tyres made the car worst, was wondering why you guys weren't out on the track, the v2 front diffuser looks very good

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That video has nothing to do with suspension. That shows the effect of downforce... Or lack of!

 

I actually turned into turn 1 slower than I was with the new splitter we just seriously underestimated how much of a difference our new splitter was making!

 

The bilsteins are top of the line Motorsport piston with adjustable valve stacks for rebound and canisters with high and low speed bump. They are seriously awesome. At Wakefield even minor adjustments could change the car.

 

Car was handling awesome on the hankooks. On the practice day I did a relatively relaxed lap and did a 1.38 just getting used to the track again. Was awesome to drive. Then we put the advans on and it was a serious bucket with bad oversteer. Problem with wtac is you get so little track time we didn't have enough time to re tune the suspension.

 

Since the event had a chat to quite a few people that found the advans different to the hankooks. The BC automotive guys were battling under steer in testing and then changed to advans and the car was actually better for them.

 

We seriously under estimated a tyre change could actually change the balance of the car. Lesson learnt...

 

 

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Stupid iPhone is being annoying uploading pics but here's one thanks to Matt Cook.

 

More soon.

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Other various pictures from the weekend and the lead up.

 

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Great pics - a lot to look at and absorb there.

 

Are you able to post a pic of the splitter that worked and the one that... worked less?

I'm interested in understanding what changed between them.

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Hoping someone here will have an broken S13 motor without a damaged block that we can buy and rehone or do a mild rebore on for a side project? If you do could you please post in here or send me a PM that'd be awesome. (Preferably in Sydney so we can come check it out and pickup)

 

Cheers!

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Great pics - a lot to look at and absorb there.

 

Are you able to post a pic of the splitter that worked and the one that... worked less?

I'm interested in understanding what changed between them.

 

There are pictures of both in the mix there tinto if you look closely. Basically the V1 splitter is the one in all the pictures until afew weeks ago which is quite effective but the new one has some more complex shapes in it and is wider with some basic canards on the sides.

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